.collect(Collectors.toSet());
    }

    private ClassRealm newRealm(String id) {
        synchronized (world) {
            String realmId = id;

            Random random = new Random();

            while (true) {
                try {
                    ClassRealm classRealm = world.newRealm(realmId, null);

                    logger.debug("Created new class realm {}", realmId);

            List<Path> extClassPath,
            List<CoreExtensionEntry> extensions)
            throws Exception {
        if (!extClassPath.isEmpty() || !extensions.isEmpty()) {
            ClassRealm extRealm = classWorld.newRealm("maven.ext", null);

            extRealm.setParentRealm(coreRealm);

            logger.debug("Populating class realm '" + extRealm.getId() + "'");

            for (Path file : extClassPath) {

        String realmId = "coreExtension>" + extension.getGroupId() + ":" + extension.getArtifactId() + ":"
                + extension.getVersion();
        final ClassRealm realm = classWorld.newRealm(realmId, null);
        Set<String> providedArtifacts = Collections.emptySet();
        String classLoadingStrategy = extension.getClassLoadingStrategy();
        if (STRATEGY_PARENT_FIRST.equals(classLoadingStrategy)) {

            throws Exception {
        if (!extClassPath.isEmpty() || !extensions.isEmpty()) {
            ClassRealm extRealm = classWorld.newRealm("maven.ext", null);

            extRealm.setParentRealm(coreRealm);

            slf4jLogger.debug("Populating class realm '{}'", extRealm.getId());

            for (File file : extClassPath) {